2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
3 * yaffs_mtdif.c NAND mtd wrapper functions.
5 * Copyright (C) 2002 Aleph One Ltd.
6 * for Toby Churchill Ltd and Brightstar Engineering
8 * Created by Charles Manning <charles@aleph1.co.uk>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 const char *yaffs_mtdif_c_version = "$Id: yaffs_mtdif.c,v 1.3 2002-09-27 20:50:50 charles Exp $";
18 #ifdef CONFIG_YAFFS_MTD_ENABLED
22 #include "yaffs_mtdif.h"
24 #include "linux/mtd/mtd.h"
25 #include "linux/types.h"
28 int nandmtd_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_Spare *spare)
30 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
33 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
36 __u8 *spareAsBytes = (__u8 *)spare;
39 mtd->write(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
41 mtd->write_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
47 int nandmtd_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare)
49 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
52 loff_t addr = ((loff_t)chunkInNAND) * YAFFS_BYTES_PER_CHUNK;
54 __u8 *spareAsBytes = (__u8 *)spare;
57 mtd->read(mtd,addr,YAFFS_BYTES_PER_CHUNK,&dummy,data);
59 mtd->read_oob(mtd,addr,YAFFS_BYTES_PER_SPARE,&dummy,spareAsBytes);
65 static void nandmtd_EraseCallback(struct erase_info *ei)
67 yaffs_Device *dev = (yaffs_Device *)ei->priv;
72 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
75 struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
76 __u32 addr = ((loff_t) blockNumber) * YAFFS_BYTES_PER_BLOCK;
81 ei.len = YAFFS_BYTES_PER_BLOCK;
84 ei.callback = nandmtd_EraseCallback;
85 ei.priv = (u_long)dev;
87 // Todo finish off the ei if required
89 sema_init(&dev->sem,0);
94 down(&dev->sem); // Wait for the erasure to complete
96 //Todo, check result of erasure
101 int nandmtd_InitialiseNAND(yaffs_Device *dev)
106 #endif // CONFIG_YAFFS_MTD_ENABLED